Antenna member and assembly

An antenna member which is configured to be mounted on a circuit board and to be used as an antenna, wherein:

• the antenna member has a split ring resonating portion, an impedance matching portion and a feed portion;
• the split ring resonating portion is provided with a facing portion which forms a split;
• the split ring resonating portion has a first side portion, a second side portion and an upper portion;
• the second side portion is positioned away from the first side portion in a lateral direction;
• the upper portion connects the first side portion and the second side portion with each other;
• the feed portion is provided on at least one of the first side portion and the second side portion;
• the impedance matching portion is made of metal;
• the impedance matching portion is positioned above the feed portion in an up-down direction perpendicular to the lateral direction;
• the impedance matching portion couples the first side portion and the second side portion with each other;
• and
• the impedance matching portion is positioned below the facing portion in the up-down direction.